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><A
NAME="SEC-COMPILING"
>Compiling Hello World</A
></H1
><P
>To compile use:</P
><P
><P
CLASS="LITERALLAYOUT"
><TT
CLASS="LITERAL"
>gcc -Wall -g helloworld.c -o helloworld `pkg-config --cflags gtk+-2.0` \</TT
><br>
<TT
CLASS="LITERAL"
>    `pkg-config --libs gtk+-2.0`</TT
></P
></P
><P
>This uses the program <TT
CLASS="LITERAL"
>pkg-config</TT
>, which can be obtained from
<A
HREF="http://www.freedesktop.org"
TARGET="_top"
>www.freedesktop.org</A
>. This program 
reads the <TT
CLASS="FILENAME"
>.pc</TT
> which comes with GTK to determine what 
compiler switches are needed to compile programs that use GTK. 
<TT
CLASS="LITERAL"
>pkg-config --cflags gtk+-2.0</TT
> will output a list of include
directories for the compiler to look in, and 
<TT
CLASS="LITERAL"
>pkg-config --libs gtk+-2.0</TT
>
will output the list of libraries for the compiler to link with and
the directories to find them in. In the above example they could have
been combined into a single instance, such as
<TT
CLASS="LITERAL"
>pkg-config --cflags --libs gtk+-2.0</TT
>.</P
><P
>Note that the type of single quote used in the compile command above
is significant.</P
><P
>The libraries that are usually linked in are:</P
><P
></P
><UL
><LI
><P
>The GTK library (<TT
CLASS="LITERAL"
>-lgtk</TT
>), the widget library, 
based on top of GDK.</P
></LI
><LI
><P
>The GDK library (<TT
CLASS="LITERAL"
>-lgdk</TT
>), the Xlib wrapper.</P
></LI
><LI
><P
>The gdk-pixbuf library (<TT
CLASS="LITERAL"
>-lgdk_pixbuf</TT
>), the image 
manipulation library.</P
></LI
><LI
><P
>The Pango library (<TT
CLASS="LITERAL"
>-lpango</TT
>) for internationalized 
text.</P
></LI
><LI
><P
>The gobject library (<TT
CLASS="LITERAL"
>-lgobject</TT
>), containing the
type system on which GTK is based.</P
></LI
><LI
><P
>The gmodule library (<TT
CLASS="LITERAL"
>-lgmodule</TT
>), which is used 
to load run time extensions.</P
></LI
><LI
><P
>The GLib library (<TT
CLASS="LITERAL"
>-lglib</TT
>), containing miscellaneous
functions; only g_print() is used in this particular example. GTK is built on top
of GLib so you will always require this library. See the section on
<A
HREF="c2025.html"
>GLib</A
> for details.</P
></LI
><LI
><P
>The Xlib library (<TT
CLASS="LITERAL"
>-lX11</TT
>) which is used by GDK.</P
></LI
><LI
><P
>The Xext library (<TT
CLASS="LITERAL"
>-lXext</TT
>). This contains code 
for shared memory pixmaps and other X extensions.</P
></LI
><LI
><P
>The math library (<TT
CLASS="LITERAL"
>-lm</TT
>). This is used by GTK 
for various purposes.</P
></LI
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